Drying agent for gases.



Fro.

LAZAB EDELE ANU, OF PLOE STI, ROUMANIA.

DRYING- AGENT FOR GASES.

No Drawing.

Specification of Letters Patent. Application filed June 17, 1911. Serial No. 633,792.

Patented Oct. 15, 1912.

To all whom, it may concern: 7

Be it known that I, LAZAR EDELEANU, doctor of philosophy, chemist, a subject of the" King of Roumania, residing at Ploesti, Kingdom of Roumania, have invented a new and useful Improvementin Drying Agents for Gases; and I do hereby declare the following to be a full, clear, and exact'descripis known, by bringing them into intimate contact with the gas to be dried. To this end, metallic chlorids, such as, e. 9., calcium chlorid or magnesium chlorid, have been used heretofore. Every expert is well aware of the disadvantages connected with the employment of these salts; when used for a long time they deliquesce and when employed in drying apparatus cause stoppages. Now I have found that by melting together mixtures made of hygroscopic metallic chlorids, particularly calcium chlorid, with the less hygroscopic sodium chlorig very lIilPOI'tfiIli advantafges are obtained, w en empo t esame ordrymg' gases, when the mdiz t re is made in defimte proportions. The relative quantities of the two substances must be so selected that for one part by weightof metallic chlorid, such as calcium chlorid, more than one part by weight of sodium chlorid is employed. The proportion of one part bywelght of calcium chlorid and three parts by weight of sodium chlorid has proved the most advantageous,

but the results are also obtained with a proportion of one part b weight of calcium chlorid to four parts y weight of sodium chlorid. If more calcium chlorid is used the mixture loses its advantageous action; if a lower proportion than one part by weight of. sodium chlorid to one part by weight calcium chlorid is used the new mixture has no advantage when removing moisture as compared with the employment of calcium chlorid.

Anhydrous metallic chlorids can be em ployed for making the molten mass or metallic chlorids containing water of crystallizat 1on. In the latter case the water of crystalilZfltlOll escapes during the melting opera- If the molten mass obtained by smelting about one part by weight of calcium chlorid and three parts by Weight sodium chlor1d is employed disintegrated for drying the gases, the pieces substantially retain their shape; they do not deliquesce and occasion no stoppage of the apparatus. In addition, this new drying agent has the advantage that it can be made ready for use again in the apparatus itself by passing hot dry {air over it.

It is worthy of notice that when using one part b weight of calcium .chlorid and three parts y welght of sodium chlorid a homogeneous molten mass can readily -be obtained, while when using increased quantit-ies of calcium chlorid and, particularly, 1

when the proportion reaches approximately equal parts by weight of calcium chlorid and sodium chlorid, this is very diflicult; in this case during the melting process layers are frequently formed, the one layer consisting of almost pure calcium chlorid and the other of almost pure sodium chlorid. In the manufacture of the drying agent calcium chlorid may be partially or wholly replaced by magnesium chlorid.

I claim: g 1. As anew article of manufacture, a dryingfient for gases which is composed of a soli ed molten mass consisting of one part,

by weight of a hygroscopic metallic chlorid mixed with more than one part by weight of sodium chlorid.

. 2. As a new article of manufacture, a drying agent for gases which is com osed of one part by weight of calcium chlorld mixed with about three parts by weight of sodium chlorid.

In testimony whereof,\I have signed my name to this specification in the presence of two subscribing witnesses.

LAZAR EDELEANU.

Witnesses CARL Vmnncx, KARL WEBER. 

